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The Water Cooler
General Discussion
New Watch Rebuild – Stunning 70's Seiko Bullhead – Dual Register Chronograph – OSA Owned – Tons Of Pics
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<blockquote data-quote="thor447" data-source="post: 3951417" data-attributes="member: 24867"><p>As much as inspection is done before starting work, even more so is done during disassembly. I was able to get the brake set correctly against the hour recording wheel. After that was done I removed the chronograph plate and continued disassembly.</p><p></p><p>Here is a photo of the parts (most of them) comprising the hour recording mechanism of the chronograph.</p><p></p><p>[ATTACH=full]341365[/ATTACH]</p><p></p><p>In the photo above, notice the position of the eccentric pin (labeled accordingly) on the left side of the photo. For those who don't do their homework on these movements this would appear to be a screw. Someone in the past had turned this eccentric pin, and it wasn't putting the correct amount of tension on the brake and intermediate wheels (probably what caused the brake to slip underneath the wheel in the first place). I readjusted the eccentric pin to the correct orientation.</p><p></p><p>[ATTACH=full]341366[/ATTACH]</p><p></p><p>There are 3 of these pins within the assembly of chronograph mechanism, 2 on the dial side and one on the rear. All three were severely out of position.</p><p></p><p>With this issue resolved I began to disassemble the rest of the components of the hour recording mechanism on the dial side of the movement.</p><p></p><p>[ATTACH=full]341367[/ATTACH]</p><p></p><p>During that disassembly the 2nd eccentric pin, which adjusts the travel movement of the hour fly-back lever (this is what is depressed on the dial side of the watch to reset the hour to the zero position). I had removed the lever by the time the photos were taken, but here is the before and after.</p><p></p><p>[ATTACH=full]341368[/ATTACH]</p><p>[ATTACH=full]341369[/ATTACH]</p><p></p><p>I had already rebuilt one of these movements in one of my own watches and had done my research beforehand. Seiko has very detailed technical documents detailing how these eccentric pins should be set. Unfortunately the previous person who worked on this watch was unaware that these are critical adjustments, but thankfully none of them caused permanent damage, it only caused the watch not to function correctly. Simply referencing the technical docs on this movement allowed for an easy fix to this issue.</p><p></p><p>[ATTACH=full]341370[/ATTACH]</p></blockquote><p></p>
[QUOTE="thor447, post: 3951417, member: 24867"] As much as inspection is done before starting work, even more so is done during disassembly. I was able to get the brake set correctly against the hour recording wheel. After that was done I removed the chronograph plate and continued disassembly. Here is a photo of the parts (most of them) comprising the hour recording mechanism of the chronograph. [ATTACH type="full"]341365[/ATTACH] In the photo above, notice the position of the eccentric pin (labeled accordingly) on the left side of the photo. For those who don't do their homework on these movements this would appear to be a screw. Someone in the past had turned this eccentric pin, and it wasn't putting the correct amount of tension on the brake and intermediate wheels (probably what caused the brake to slip underneath the wheel in the first place). I readjusted the eccentric pin to the correct orientation. [ATTACH type="full"]341366[/ATTACH] There are 3 of these pins within the assembly of chronograph mechanism, 2 on the dial side and one on the rear. All three were severely out of position. With this issue resolved I began to disassemble the rest of the components of the hour recording mechanism on the dial side of the movement. [ATTACH type="full"]341367[/ATTACH] During that disassembly the 2nd eccentric pin, which adjusts the travel movement of the hour fly-back lever (this is what is depressed on the dial side of the watch to reset the hour to the zero position). I had removed the lever by the time the photos were taken, but here is the before and after. [ATTACH type="full"]341368[/ATTACH] [ATTACH type="full"]341369[/ATTACH] I had already rebuilt one of these movements in one of my own watches and had done my research beforehand. Seiko has very detailed technical documents detailing how these eccentric pins should be set. Unfortunately the previous person who worked on this watch was unaware that these are critical adjustments, but thankfully none of them caused permanent damage, it only caused the watch not to function correctly. Simply referencing the technical docs on this movement allowed for an easy fix to this issue. [ATTACH type="full"]341370[/ATTACH] [/QUOTE]
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New Watch Rebuild – Stunning 70's Seiko Bullhead – Dual Register Chronograph – OSA Owned – Tons Of Pics
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